On Monday, the main stock market indices ended the day on a down note. Sensex closed 0.93% lower at 71,355.22, and Nifty closed 0.91% lower at 21,513. Market volatility, measured by India VIX, increased by 7.01%, indicating a decrease in market stability. Top gainers in Nifty 50 included Adani Ports, HCL Technologies, and ONGC, while …